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/* Memory ranges
Copyright (C) 2010-2013 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "memrange.h"
int
mem_ranges_overlap (CORE_ADDR start1, int len1,
CORE_ADDR start2, int len2)
{
ULONGEST h, l;
l = max (start1, start2);
h = min (start1 + len1, start2 + len2);
return (l < h);
}
/* qsort comparison function, that compares mem_ranges. Ranges are
sorted in ascending START order. */
static int
compare_mem_ranges (const void *ap, const void *bp)
{
const struct mem_range *r1 = ap;
const struct mem_range *r2 = bp;
if (r1->start > r2->start)
return 1;
else if (r1->start < r2->start)
return -1;
else
return 0;
}
void
normalize_mem_ranges (VEC(mem_range_s) *ranges)
{
/* This function must not use any VEC operation on RANGES that
reallocates the memory block as that invalidates the RANGES
pointer, which callers expect to remain valid. */
if (!VEC_empty (mem_range_s, ranges))
{
struct mem_range *ra, *rb;
int a, b;
qsort (VEC_address (mem_range_s, ranges),
VEC_length (mem_range_s, ranges),
sizeof (mem_range_s),
compare_mem_ranges);
a = 0;
ra = VEC_index (mem_range_s, ranges, a);
for (b = 1; VEC_iterate (mem_range_s, ranges, b, rb); b++)
{
/* If mem_range B overlaps or is adjacent to mem_range A,
merge them. */
if (rb->start <= ra->start + ra->length)
{
ra->length = max (ra->length,
(rb->start - ra->start) + rb->length);
continue; /* next b, same a */
}
a++; /* next a */
ra = VEC_index (mem_range_s, ranges, a);
if (a != b)
*ra = *rb;
}
VEC_truncate (mem_range_s, ranges, a + 1);
}
}
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